Walker Sparks is a pre-made Sim from Lucky Palms. He is a widower who lives with his only daughter, Piper, at 95 Sonora Street. His late spouse isn't mentioned in his bio, and she doesn't appear in the family tree either. However, it could be assumed that Glorianna Sparks, a deceased Sim at the graveyard, is Walker's late spouse.

Walker has been widowed since Piper was a baby. And ever since, he has had difficulties managing his career and raising Piper himself. Walker wants to provide financial security to her, but he works so hard that he has become a Workaholic. This makes him an absent father to Piper, making both of them have even less time to spend together. This caused Piper to dislike him, as they have very poor relationship to each other. Even though she dislikes him, Walker actually loves his daughter very much, but couldn't express his feelings. He wishes to fix their relationship before it's too late.

Walker works as a Gene Therapist in the Medical career, and his performance is rather high; almost reaching the promotion. It's a level 7 job, which implies that Walker has worked hard to reach that level, thus became a Workaholic and had no time to spend with Piper. His lifetime wish is to become a World-Renowned Surgeon. He has 5 skill points in Logic, which is rather low for his current career, 3 in Charisma, 1 in Athletic, and 2 in Handiness.